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The type of attr attribute in Android

1、reference: resources ID.

1.1 Attribute definitions :

<declare-styleable name = " name ">
       <attr name = "background" format = "reference" />
</declare-styleable>

1.2 Attributes use :

<ImageView
         android:layout_width = "42dip"
         android:layout_height = "42dip"
         android:background = "@drawable/ picture ID"
         />

2、color: Color value .

2.1 Attribute definitions :

<declare-styleable name = " name ">
       <attrname = "textColor" format = "color" />
</declare-styleable>

2.2 Attributes use :

<TextView
       android:layout_width = "42dip"
       android:layout_height = "42dip"
       android:textColor = "#00FF00"
       />

3、boolean: Boolean value .

3.1 Attribute definitions :

<declare-styleable name = " name ">
    <attr name = "focusable" format = "boolean" />
</declare-styleable>

3.2 Attributes use :

<Button
        android:layout_width = "42dip"
        android:layout_height = "42dip"
        android:focusable = "true"
         />

4、dimension: Dimension value .

4.1 Attribute definitions :

<declare-styleable name = " name ">
      <attr name = "layout_width" format = "dimension" />
</declare-styleable>

4.2 Attributes use :

<Button
       android:layout_width = "42dip"
       android:layout_height = "42dip"
      />

5、float: Floating point value .

5.1 Attribute definitions :

<declare-styleable name = "AlphaAnimation">
       <attr name = "fromAlpha" format = "float" />
       <attr name = "toAlpha" format = "float" />
</declare-styleable>

5.2 Attributes use :

<alpha
       android:fromAlpha = "1.0"
       android:toAlpha = "0.7"
       />

6、integer: integer .

6.1 Attribute definitions :

<declare-styleable name = "AnimatedRotateDrawable">
        <attr name = "visible" />
        <attr name = "frameDuration" format="integer" />
        <attr name = "framesCount" format="integer" />
        <attr name = "pivotX" />
        <attr name = "pivotY" />
        <attr name = "drawable" />
 </declare-styleable>

6.2 Attributes use :

<animated-rotate
       xmlns:android = "http://schemas.android.com/apk/res/android"  
       android:drawable = "@drawable/ picture ID"  
       android:pivotX = "50%"  
       android:pivotY = "50%"  
       android:framesCount = "12"  
       android:frameDuration = "100"
       />

7、string: character string .

7.1 Attribute definitions :

<declare-styleable name = "MapView">
       <attr name = "apiKey" format = "string" />
</declare-styleable>

7.2 Attributes use :

<com.google.android.maps.MapView
         android:layout_width = "fill_parent"
         android:layout_height = "fill_parent"
         android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
         />

8、fraction: percentage .

8.1 Attribute definitions :

<declare-styleable name="RotateDrawable">
       <attr name = "visible" />
       <attr name = "fromDegrees" format = "float" />
       <attr name = "toDegrees" format = "float" />
       <attr name = "pivotX" format = "fraction" />
       <attr name = "pivotY" format = "fraction" />
       <attr name = "drawable" />
</declare-styleable>

8.2 Attributes use :

<rotate
      xmlns:android = "http://schemas.android.com/apk/res/android" 
      android:interpolator = "@anim/ Animation ID"
      android:fromDegrees = "0" 
      android:toDegrees = "360"
      android:pivotX = "200%"
      android:pivotY = "300%" 
      android:duration = "5000"
      android:repeatMode = "restart"
      android:repeatCount = "infinite"
     />

9、enum: Enumerated values .

9.1 Attribute definitions :

<declare-styleable name=" name ">
       <attr name="orientation">
              <enum name="horizontal" value="0" />
              <enum name="vertical" value="1" />
       </attr>            
</declare-styleable>

9.2 Attributes use :

<LinearLayout
        xmlns:android = "http://schemas.android.com/apk/res/android"
        android:orientation = "vertical"
        android:layout_width = "fill_parent"
        android:layout_height = "fill_parent" >
</LinearLayout>

10、flag: Bitwise OR operation .

10.1 Attribute definitions :

<declare-styleable name=" name ">
        <attr name="windowSoftInputMode">
                <flag name = "stateUnspecified" value = "0" />
                <flag name = "stateUnchanged" value = "1" />
                <flag name = "stateHidden" value = "2" />
                <flag name = "stateAlwaysHidden" value = "3" />
                <flag name = "stateVisible" value = "4" />
                <flag name = "stateAlwaysVisible" value = "5" />
                <flag name = "adjustUnspecified" value = "0x00" />
                <flag name = "adjustResize" value = "0x10" />
                <flag name = "adjustPan" value = "0x20" />
                <flag name = "adjustNothing" value = "0x30" />
         </attr>         
 </declare-styleable>

10.2 Attributes use :

<activity
      android:name = ".StyleAndThemeActivity"
      android:label = "@string/app_name"
      android:windowSoftInputMode = "stateUnspecified | stateUnchanged | stateHidden">
      <intent-filter>
             <action android:name = "android.intent.action.MAIN" />
             <category android:name = "android.intent.category.LAUNCHER" />
      </intent-filter>
</activity>

11、 Attribute definition can specify multiple types of values .

11.1 Attribute definitions :

<declare-styleable name = " name ">
       <attr name = "background" format = "reference|color" />
</declare-styleable>

11.2 Attributes use :

<ImageView
        android:layout_width = "42dip"
        android:layout_height = "42dip"
        android:background = "@drawable/ picture ID|#00FF00"
        />

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